[clang] [clang][CodeGen] `sret` args should always point to the `alloca` AS, so use that (PR #114062)

[Alex Voicu via cfe-commits]

AlexVlx wrote:

> ping, this really needs to be in the release branch. The device library build is broken without this

@rjmccall any additional issues / comments / suggestions / objections?

https://github.com/llvm/llvm-project/pull/114062